Impact of Multipath Signals on Terrestrial Fixed Service Interference in Aeronautical SATCOM

For the characterization of radiofrequency interference caused by terrestrial fixed service stations into aircraft earth stations that communicate with geostationary satellite orbit networks in the fixed-satellite service, a detailed channel model is developed. We assess the impact of coherent and non-coherent scattered components of terrestrial fixed service emissions into the aeronautical satellite communications receivers. Firstly, a line-of-sight channel model is presented, which is extended by elements accounting for specular reflection from the Earth's surface and randomly Rayleigh distributed diffuse components. Based on the surface roughness of the spherical Earth model at 18 GHz, we determine the reflection coefficient for typical surfaces. To this end, we provide insight on whether the coherent and non-coherent elements of terrestrial fixed service interference should be considered for aeronautical SATCOM receivers.